build(deps): bump syn from 1.0.31 to 1.0.37

[dependabot-preview]

Bumps syn from 1.0.31 to 1.0.37.

Release notes

Sourced from syn's releases.

1.0.37

• Handle shebang in a way that matches rustc 1.46+ (#876, rust-lang/rust#71487, rust-lang/rust#73596)

  #!//am/i/a/comment
  fn main() {} // ^ shebang

  #!//am/i/a/comment
  [allow(dead_code)] // ^ not a shebang
  fn main() {}

• Accept tuple.0.  0 as a tuple indexing expression (#877)

1.0.36

• Add Lit::span, Lit::set_span (#874)

1.0.35

• Fix parsing of Expr::Field in non-full mode (#870)

1.0.34

• Documentation improvements

1.0.33

• Parse tuple.0.0 as an indexing expression (rust-lang/rust#71322)
• Add Parse impls for optional of proc-macro2 types: Option<TokenTree>, Option<Punct>, Option<Literal>, Option<Group>

1.0.32

• Fix parsing $:item macro_rules metavariables containing outer attributes (#852)

Commits

• e8e929b Release 1.0.37
• 1e31fdf Respect RUST_MIN_STACK initializing Rayon threadpool
• 25efb26 Update test suite to nightly-2020-08-03
• db6bfac Adjust location of standard library sources
• 253190e Avoid invalid parenthesized const generic method arg in test
• 531d342 Merge pull request #877 from dtolnay/multiindex
• 68fa44d Stop rustfmt from mangling tuple multi-index test cases
• dc2609f Fix parse of tuple multi index tuple.0. 0
• 86d3e60 Add regression test failing on tuple.0. 0
• 5647268 Merge pull request #876 from dtolnay/shebang
• Additional commits viewable in compare view

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